$($b$)$ Given the rollowing levelling data Table Q$2\mathrm{.}1,$ calculate the reduced levels $($RL$)$ for point B until E$,$ using the Rise and Fall method.

Table Q$2\mathrm{.}1$: Levelling data

$(5$ marks$)$

$\backslash$table$[[\backslash$table$[[$Statio$],[$n$]],\backslash$table$[[$Back Sight$],[($BS$)]],\backslash$table$[[$Intermediate$],[$Sight $($IS$)]],\backslash$table$[[$Fore Sight$],[($FS$)]],$Rise and Fall,$\backslash$table$[[$Reduced Level$],[($RL$)]]],[$A$,1\mathrm{.}500,,,,100\mathrm{.}000],[$B$,,1\mathrm{.}200,,,],[$C$,1\mathrm{.}600,,1\mathrm{.}800,,],[$D$,,1\mathrm{.}400,,,],[$E$,,,1\mathrm{.}700,,]]$